Space heater



May 16, 1944. M. scHUEDER E'rAL SPACE HEATER Filedlarch 1, 1939 vs shetsneet 1 Illllllulli mm G. M. scHuEDER Er AL Re. 22,482

SPACE HEATER May 16, 1944.

5 Shasta-Sheet 2 Filed March 1., 1939 wmv-.1I mummy v INVENTORS gear e M ,Schaeffer BY( azzelfczrfezl ATTORNEY.

'MW 16, 1944- G. M. SCHUEDER ETAL Re 22,432

sPAoE HEATER Filed March 1, 1959 3 sheets-sheet s' t8 si Reissued May 16,` 1944 George M.

Schueder and Eugene -F. Farrell, De-

troit, Mich., assignors to Evans Products Gompany, Detroit, Mich., a corporation of Delaware Original No.

2,268,723', dated January 6, 1942, se-

rial No. 259,094, March 1, 1939. Application for reissue November 19, 1942, Serial 42 Claims.

This invention relates to certain improved features, arrangements, and constructions for space heaters or the like, and has special reference to floor-supported, air circulating,` unit heaters for f rooms, small homes or the like which are directnred or contain a high temperature air heatingcombustion unit burning oil, gas, or other fuels, and which contain a fan. in their lower portions to pull air to be heated downwardly therethrough, and to provide a low level, but safe, forced clischarge of the relatively high temperature air across the room iioor.

Preferably, the f an or blower, the air heating unit, the air openings and other parts are so arranged that the heater may be operated, if so desired. by the conventional or natural upward, thermal convection air flow therethrough,l or else by the above-mentioned blower-forced downward or contratherrnal air iiow.

In the two illustrated embodiments of the present invention, the unitheaters include an upright cabinet having upper and lower air openings and containing an upright combustion-air heating unit. This heating unit may employ the conventional pot-type burner for oil orthelike housed in a drum also forming the expansion chamber. Associated with this combustion unit is an upwardly-extending air-heating passage. As will be apparent to those skilled in this art, various types of combustion units or associated air stratification of the air and cold floors. uneven distribution results in high temperature in the upper portion of the room and compara-A tively low temperature yat anni adjacent the door level, reduces the comfort materially, and requires that more heat and fuel be used to reach the desiredcomfort level. Y

' heating passages may be 4employed within `the purview of this invention.

The bottom of the air heating passage is closed, preferably by a` closed bottom for the cabinet spaced slightly above the room -oor by the cabinets supporting feet. Preferably, this lower air opening is formed by a long, narrow grille extending across thefront portion of the cabinet adjacent its bottom and comprising upright 'members integral with the cabinet side walls.

The upper air opening may be a large area grille in the fiat top of the cabinet.

The above-described structure will operate by the conventional natural or upward air flow, and this type of operation is more or less satisfactory for smallor moderate amounts of heating or for low fuel settings. However, it will be appremoved about 18 inches from the heater, perature ismuch lower,

cooler air, and, in addition,

Therefore, it is desirable toforce the heated air out close to the iioor and preferably in a thin, wide stream'across the room. This h'at the lower portion of the room and give proper distribution of air, but will increase the comfort by proper air circulation. However, in the large capacity space heaters of this type employing a high temperature combustion type air heating means,4 the air discharge from the lower opening or grille may be at temperatures of as high as or over 250 F. l

Whereas the underwriters will not permitthe floor temperature to be raised more than about F. above room temperature, or to la maxi-- mum of about F., if airat even as high a temperature as this is permitted to strikev the floor, it will produce undesirable results since it will be injurious to floor covering, such as linoleum, or to the wood of the iloor itself.

The present invention provides means to eject this forced or relatively high Velocity stream or air across the floor in a stream which issues from the heater cabinet very close to the floor but sub,- stantially parallel thereto or having little or no downward component sothat it does not strike the floor close to the heater. After the air has its temdue to diffusion with warm air is rising from `the stream'so that hot air striking the floor beyond this'range'will not be objectionable.

This invention contemplates a very simple arrangement or means to force and direct this er inthe lower part of the cabinet at or about ciated that when it is desired to greatly increase the rate of heat, this natural or chimney type of air circulation limits the capacity of the unit so that blower-forced circulation is desirable, However, if the blower or fan is used to assist the upward iiow and distribution of the heated air, it merely accentuates one of the objections of the upward iiow type space heaters: that is,

the level of the lower opening, so that the fan blades themselves force the air in a substantially horizontal stream and give it directly the desired directional characteristics. Thus it is not essential to have air directing vanes or fins associated with the lower opening, and it will be appreciated that since the air is being pulled or drawn down through the air heating passage,

which is thus at a slightlysub-atmospheric presmovable or shutter in the upper portion of sure, it is not necessary to employ any top closure the cabinet to ahievedownward air flow. Pref- This" will not only orably, this ran is positioned under the an nea ing unit; and in the preferred form it consistsV .of a wide, thin or flat, centrifugal blower ofthe "backward tipped" blade type, theV advantages of which are mentioned hereinafter;

Where the long. narrow, blower discharge opening or grille is substantially cli-extensive with the eifective discharge area ofthe blower.

or where this grille extends around the periph-- ery of the centrifugal blower, as in Figs. land 4, no plenum chamber or relative restriction of the opening formed by the grille will be necessary to achieve flow of air from the whole length ofv the grille. discharge grille extends across the front face of the rectangular cabinetcontaining the blower, it is desirable*l to form these lower openings as However, Vin cases where the long aaien ture auis forced and is horizontally directed by the fan or 'blower blades to and out this lower ,Y mediately striking) the room oor; to provide a` heater of thistype in whichthe air is drawn relatively restricted so that the high temperature air `buildspup a pressurein a plenum chamber, thus insuring its discharge through the whole length of the opening.

In either form of the device, it is desirable to make this lower grille integral with the side walls of the cabinetgand formed of upright members which form a part ,o f and strengthen or brace the cabinet sidewalls.- In addition, in the case of a iiat front, rectangular cabinet, these upright members form relatively short restricted openings tending to produce an outward air flaw normal to the cabinet front. The capacity oi' a given unit 'may be raised by forced draft to the combustion unit supplied Y by a connection from' the air circulating fan or blower, and, in addition, the manual control for the fuel setting may be'interconnected to the' vswitch for the blower electric motor so that the A blower goes on only at high re or high fuel settings and is automatically turned off at lowiire. In order to reduce noise and vibration, both the fanandits drivingelectric motor are carried by a vibration-absorbing mounting, and inorder to `permit ready replacement or servicing for the cheap ty'pe of electric motor, this motor or the motor blowerv unit is mounted so that it may be readily removed through the cabinet bottom.

It is important. particularly where a rather cheap type of electric motor is used, that it be mounted out of the path of high temperature air and positioned away from radiated heat. In addition, it is desirable to further reduce its temperature by providing means for drawing cool air over or through this motor by a connection to the intake side of the air circulating fan.

The tank'for oil or other fuel andthe float valve control chamber are also mounted out of the` path of high temperature air and are shielded from radiatedheat. In the case of a completely enclosed cabinet, shown herein as of the low boy type, these two units are mounted in an auxiliary, upwardly-extending and open-ended air passage which is ysorarranged that the blower A y operation draws cool air over units.

Otherfeatures and arrangements of this invention will be apparent from the detailed description and drawings herein. In general, the objects of this invention are to providey an improved and simplified unit space heater providing` forced, low level discharge of hot air. n y

More particularly, objects of this invention are to provide a forced 'air circulating space heater in which the-fan or blower is positioned and past these opening. thus eliminating the necessityy for any vanes, fins, or thef like to guide this high temperature air on its discharge from the cabinet. l and thus providing a safe stream of high'temperature air across and` close to (but not imor pulled down through the air heating passage, thus removing the need for any upper or top shutters or other closures to selectively prevent or permit the4 upward thermal now; and to provide forced draft to the combustion unit from the same air circulating fan or blower.

Other objects of this invention are to provide a space heater which is particularly quiet in operation by carrying the blower and its driving motor on vibration-absorbing mountings, and to provide a space heater,

electric motor mounted so that it can be readily removed, positioned out of the path of high temperature air, shielded from radiated heat, and having means so that the air circulating fan or blower pulls cooling air over or past this electric motor to reduce its temperature. v

Other objects will be apparent from the foregoing statement of the general features and advantages of thisinvention and from thefollowing detailed description and drawings.

Referring to the drawings, in which:

Fig. 1 is a general view of a space heater, in side elevation, embodying a. preferred form of the invention, a portion being broken away to disclose the nature of parts interiorly of the space heater:

Fig. -2 is a view thereof, in vertical section, taken substantially on the line 2-,2 of Fig. 1, except that the blower 32, the burner 6, and assoi ciated parts are shown in elevation;

Fig. 3 is a transverse section taken on the-line 3--3 of Fig. 1;

Fig. 4 is a transverse section taken on the line l-I of Fig. 1:

Fig. 51s a front view of a rectangular or "low boy typel space heater of an4 alternative construction. the outer casing or shell thereof being sectioned away centrally and longitudinally of said casing to disclose an alternative embodiment of the invention;

Fig. 6 is a view of the ,bottom of the space heater shown in Fig. 5, parts being broken away to disclose the nature of underlying parts;

. Fig. 'I is an endviewof the construction shown in Fig. 5, the casing and parts interiorly thereof being broken away to show ythe control mechaon the line 8 8 of Fig. 5;

Fig. 9 is a detail fragmentary top plan view of the means for mounting the motor, and

Fig. 10 -is a fragmentary view to. show the moA tor mounting depicted in Fig..9, in side elevation,

at `substantially the same level as the low-level lateral discharge opening so that high temperaand also to disclose diagrammatically the connection between the valve control means and the switch;controlling operation of the motor, the motor being shown in side elevation and the control wheel in top plan.

l Referring now more ings: The embodiment of Figs. 1 to 4, inclusive, discloses a -very cheap and compact form of lspace vheater which is designed lfor maximumperformance at a low pricewhich is not entirely selfor the like, which may employ a relatively cheap type of blower-driving particularly to the draw-,- l

stamping having an integral sacan 4 formed therein. The elements of the grille l Casing air passage grille.

are simply cut and bent-over portions lof the' uppersurface of the cap 3, and it will be `apparent that these elements, being integral with the cap, serve to brace or maintain its rigidity and also give a pleasing exterior appearance with low resistance to air K flow therethrough. It will be apparent to those skilled in this art that casing I rand cap l may be formed of sheet metal in other waysif desired.

When liquid fuel, such as oil, is'used, this yheating unit is provided with a fuel reservoir 5 which may be positioned exteriorly and laterally o f the casing I and supported thereon'. Fuel, such as oil, is conveyed from reservoir 5 by means of a pipe Il through a manually regulatable valve and float type level control-4 unit 9 and by pipe I0 to a pot-type burner 6. Pipes 9 and I0 are provided with conventional or approved fittings, and since the details of the valve-,float unit 9 and the pot burner E form no part of the present invention and are well-known in this art, they y are not illustrated or further discussed herein.

As is conventional in this art, lthe fuel control valve unit 9 is provided with a suitable control 1 linkage l(not illustrated) whereby the fuel supply can be turned on or oil and regulated from some desired point.

The upright combustion unit 1 comprises a drum formed by a cylindrical member having side walls II and upper and lower eni walls I2 and i3, respectively, which are joined and sealed to the side walls in any desired manner. This combustion unit is divided into an expansion chamber Il and a burner chamber I5 by a horizontal partition plate I5 having an up-turned, peripheral flange welded screwed, or otherwise suitably secured to the walls I I. From this plate and 2l and having open upper and lower ends. referably, this shroud or shield 2| extends from,- or slightly above, the top of the combustion unit 1 to the bottom of the expansion chamber` Il,

and it is of curvilinear transverse form surrounding the expansion chamber Il. Shroud 2I divides passage I9 into an inner and an outer portion. Such a shroud acts as a radiation shield and aids in reducing the `temperature oi' the outer shell. It also confines the air being heated in the inner passage, raises its velocity and in,- creases the efilciency of the heater.

An opening 24 is provided in the front of the shroud 2l which, together with door 25 in casing I and door 25 in wall II, provides access to the interior of the expansion chamber Il for lighting the burner, cleaning it, etc. It will be noted Aout through doors 25 and 26 that upon removal of damper I8, the fitting connecting pipe III to burner 9 may be removed through I1, after which burner 6 may be lifted servicing, or the like.

To increase the eillciency of. .this space heating unit, an economizer 20, consisting of a downwardly-extending heat exchanger and additional expansion chamber, is provided outside of shroud 2l in the outer part of passage tional heat may be removed from the escaping ilue gases. As shown in Figs, l Iand 3, the combustion unit 1 -is disposed eccentrically of and towards the front of the heating unit in order to provide room for thisleconomizer 2li, which is illustrated as being between'the shroud 2i and the casing l although it will be apparent that it might be positioned inside the shroud if desired. A cross-section through the upright walls of reconomizer chamber 2li, which may be formed of sheet metal in any desired manner, shows that 'it is formed of an elongated and curved oval,

I economizer 20 where they undergo additional ex- I8 the burner 6 is suspended centrally of the A vertical axis of the stove. The combustion unit 1 may be suitably supprted from the casing I by any conventional means, but, as shown, this lsupporting is achieved by a plurality of conduits I1I1, rigidly but removably connected to bothv the casing I and the walls I I, and by tubes 5I--5I rigidly but removably connected to walls II and plate l2. Flue connections 21 and 2B brace the upper portion of the combustion unit with respect to casing I. Air to support combustion is supplied through these conduits I1--II, and this air supply may be regulated by means of suitable damperslBf--IS positioned at the outside ends of the conduits I1. may be of any approved or conventional type, they are shown as being of the rotary, divideddisk type. The numeral I9 designates the air heating space passageway between the walls Il and the outer casing I. It will be noted that this passage I9 is open at its upper and lower ends.

The side walls II of the expansion chamber il II by suitable brackets 22 Although the dampers I8,

or upwardly-extending passage or pansion and give-up additional heat, and are conducted `by removable ifiue connection 25 to the stack or the like. This economizer chamber 20 may be supported in any convenient manner, suchas its connections tothe iiue pipes 21 and 28, and, as noted above, it and its connections 21 and 28 alsoserve to brace 'drum 1.

The complete combustion unit 1 with its shroud 2l may be removed for major servicing by removing cap 3 and lifting these units out the open topafter disconnecting conduits I1-I1, 5 I-5I, pushing ilue connection 28 back into economizer 20, pushing economizer 20 in close to shroud 2|, and disconnecting oil pipe I0. This heater is assembled in substantially the reverse order of operation.

Aswill be discussed in greater detail hereinafter, air to be heated may rise through passageway I9 by normal, thermal circulation, or, at the option of the user, air` may be pulled down through space I9 by a fan or blower.

A blower unit or fan means, designated generally by numeral 3|, is provided in the lower portion of the cabinet below the combustion unit 1. Although various types of blowers or fans may be employed within the broad purview of this invention, in the preferred embodiments illustrated, this blower unit employs a comparaand opening 2 4 for I9 so that addi- 'zpntally to and out the grille openings.

32 is intended tol be Vrotated counter-clockwise. As isunderstood -in the ventilating art, this backward tipped. blade type V olf centrifugal l blower will deliver a'large volume of air at comparatively low velocity as distinguished from the high velocitydischarge of a small volume. In

`addition it is a quiet running type.

It will benoted that the motor-blower unit 3| cylindrical casing I (see Fig. 4) so that the im- 4 perforate back portion of wall I, will form a more eicient scroll closer to the blower blades.

n 1s mounted on the susa as Blower wheel of a conventional-electric motor 34 which is ener# gized and controlled by a conventional circuit and conveniently positioned switch which are not illustrated herein.A Armsv 35 secured onthe casing 34 are bolted or otherwise secured vto the supporting disk 36. These arms 35 may be formed of suitable vibration-absorbing and i sound-deadening material, such asa plastic, or

4) The inwardly-turned tangs 46 are arranged to point toward the axis of blower unit 3l to give a radial guiding elect to the air discharged from the blower 32. It is conventional to place such heaters' against the wan, and a wm 'be noted that the ports 29 donot extend around the back por- I "is positioned eccentrically or to the rear of the 5 there may be yieldable,vibration-absorbing and sound-deadening material, such as rubber, interposed between arms 35 and disk'36 to quiet the operation of the blower-motor unit.

A circular base plate 3'I is securedin the lower part of casing I inany convenient manner,such

I as a welded or other connection between an integral iiange or apron and the walls of casing I. The base plate is provided with a circular aper-k ture 39 which is positioned eccentrically thereof and towards the rear of theheating unit. 'I'his aperture is larg'e enough to lpass the blower wheel 32 but is `slmaller than the disk 36. 'I'he supporting disk 36 is suitably and'removably secured to plate 31 by bolts 4I. It will be apparent that by undoing bolts 4I the entire blower unit l can be removedfor servicing or replacement since theblower wheelcan be withdrawn through the circular aperture 39. Above, and in close proximity to, the blower wheel 32 'is an enclosure disk 42 secured tothe walls tegral, upwardly-extending similar toiiange 38 ofV plate of shell I by an iniiange 43 otherwise axis oi the blower unit 4I and is dened by a uniformly rolled lip 45 formingi effect, a nozzle' .extending slightly within the open upper end of the blower wheel 32. It will be apparent that when theblower is not running and the burner is operating, air may enter through the grille openings 29, pass through the blower blades and aperture 44, and riseup through the heating passageway I9 to be discharged through the top grille 4. When theblower is runningg'it will pull air down through a-reverse of .this path and discharge it directly out through the grille openings 29. Note that the blower itself and its horizontally-directed discharge are at the same horizontal level with the grille openings. so thatthe blower blades themselves give the air stream its directional characteristics, discharging it hori- 4 These openings `are spaced slightly above the floor so that the highI temperature air issues in a wide, fiat, substantially not immediately lm pinge upon the floor and cause dangerous overheating thereof.

This lower openingor grille is formed of a number of short ports 2 9 extending a little more thanhalfway around the circular casing I. Each individual portis preferably of rectangular contourI and is producedby shearing three of the four sides of the port, thereby producing a tang 4e extending from the fourth side (Figs. 1 and Y `3I. Disk 42 has a4 circular aperture 64 which is concentric with the horizontal. stream which does -the iioor and through or l3B, and the disk 36 tions of the heater unit so that high temperature air is not discharged against the wall.A 'Ihe upright, yintegral tangs 46 form a part of the casing I and afford a considerably stronger 'constructiongthan would be obtained by a separate grille. It will valso be noted that ports 29 arranged around the periphery ofthe circular casing serve to fan out""the stream of air; that is,.the air,

being more or less radiallydirected, will emerge in a widening stream."

In this form of the invention, formed by ports 29 of the integral grille may be quite large relatlveto the rate of discharge from the blower' wheel 32, so that there is compara- Y tively little pressure built up'in theblower chamber for between the bottom 31 and the partitlonldsk 42 and the air is thrown' out through the 'openings 29 with little or no jet effect. Thus it will befapparent that in this form of the in` vention the openings or ports 29 do not neces sarlly have to perform any function of directing the air stream.

It is desirable` that the-heater be so designed that a cheap type of electric motor can be used. To this end, the motor-blower unit is vreadily removable for servicing, as discussed above, and, in addition, since a cheap type motor is particularly susceptible to overheating', it is necessary ,that it be kept coo1. 'I'his is accomplished by mounting 4 it in the space beneath the cabinet bottom where it is shielded from the high temperature rair stream and radiated heat -by the bottom 31. In

addition, it is desired to cool this electric motor- 34 by the following arrangement. 'I'here is a space 41 between the motor and the bearing disk has a relatively large area opening-43' 4for the motor shaft and for air ilow.

'I'he bottom of the blower wheel has a plurality of apertures around its shaft so that the invterior or low pressure region of the blower wheel is communicated through Vthese openings 49" and opening 43 to the space above the electric motor. Thus, when the blower is running, relatively Acool air on or adjacent the oor will be drawn up from around the motor to cool the same. 'I'his slight addition of cool air will not materially aii'ect the heaters performance.

given size unit for high fuel settings, itis advantageous to add a regulated amount of air under forced draft to the combustion unit. To

- this end, conduit or elbow tube l5| is disposed rearwardly of the space heater to connect the burner chamber I5 with the blowerA chamber 52 between the'plate 31 and the baillel 42. It will be noted that this tube 5|v communicates the burner chamber with that part of chamber 52 which is remote from the ports 29 and consequently at its point of highest pressure. [A suitable damper 53 mounted on a shaft 54 to be manually adjusted by handle 55 may control the flow of .air through tube 5I. If it is desired to achieve a' pressure materially that of the atmosphere in burner chamber I5, dempers I8 should be closed. Howevensince the burner chamber.' normally draw'sfin air through air supply conduits I'I and is thus at a slightly sub-atmospheric pressure, a material increase in the opening Inr order tol raise the combustion rate of a i the blower above l 22,482 l y 5 the burner air supply will be achieved if the pressure therein is raised to about atmospheric, in which case dampers I8 maybe left partly open.

Figs. 5 to 10, inc., disclose an alternative embodiment of the present invention including a so-called "low boy" or rectangular type of cabinet which encloses all of the operating units, such as the oil tank, iioat valve unit, etc. In this modlcation, the blower 6| is driven by a small, cheap, electric motor 92 by means of a conventional V-type belt B8. n

' In the description oi. this modification, those features or units, lsuch as the combustion unit, the centrifugal blower, the control valve-float chamber, and others, which are similar to those described above in connection with Figs. 1 to 4. inc.. will not be discussed in detail nor their similar advantages or cooperations further. pointed out.

In general, this construction comprises a generally rectangular or oblong sheet 'metal base Il supported by suitably secured sheet metal reet `88-85, a sheet metal casing 6B of rectangular 'transverse contour with rounded corners and rounded top edges, and a large area opening or openings formed by an integral grille 61 .in the top thereof. This casing or shell 66 with its integral top and grille 51, may be formed from sheet metal in any desired or conventional fashion.

'I'he base 84 carries and servesas a support for all the operating units of this heater, and

the casing 66 which is in the form lof an openbottom shell is slipped down over the base and its several operating unita-supported thereon and 35 suitably secured thereto. Base 6I carries a vertical partition 69 or insulating baille also serving as a radiation shield which extends 'from iront to back of the base and the casing 86 and approximately to the top oi the combustion unit. o

Fuel tank 58 is removably supported by brackets 88C on the other side of partition 69 from the combustion unit. A suitable door in the end of the cabinet BB permits a combinedflller spout and closure unit to be swung out through this door opening for filling. In addition, this `door permits inspection of a suitable oil or fuel level indicator 68B.

Fuel is conveyed from the tank 8B to a suitable or pot-type burner 1| within the drum-like combustion unit 12 by means of a pipe line 13 having suitable ttings and including a control valveiloat chamber unit of the same type as unit 9 discussed above. Although not illustrated, the burner 1| is supported in the combustion unit 12, and the combustion unit is divided by a partition into an expansion chamber and a burner chamber substantially in the manner disclosed in connection with Figs. 1 to 4, inc.

Flue gases are exhausted from'the combustion unit 12 by an upper flue connection 15 and a/v downwardly extending economizer hear, exchanger 16 (which is formed of sheet metal in any desired fashion) and iout through lower ue connection to a conventional stack or chimney. Note that theeconomizer-heat exchangerr 18 is positioned outside of the shroud or radial tion shield 8B in the upwardly-extending space between the combustion unit and the upright partition 69. I Combustion vunit 12 is mounted on the hori-` zontal partition member 18 which is in turn supported from the base 64 by downwardly-turned end portion 19 and braces or supports 8| and 82. The downwardly-turned end portion 19 or this partition 18 may be suitably secured to upwardly-extending partition 89. It will be-noted that this partition 18 with its downwardly-turned end portion 19 and its braces 8| and 82, which last are suitably secured to the bottom 6l, form with the bottom 84 a rigid box-like Airamefor the base of this heater unit. This irame is quite strong and rigid although it is made of a relatively smallquantity of sheet metal. In addition, it will be apparent that this frame is tied to and cooperates with the upwardly-extending partition 68 to brace the sheet metal walls of the cabinet 6B. Front, back, and one end of the ilat chamber coveredby this partition 18, are formed Aby the front, back, and one end wall of the cabinet 99. v

Partition member 1B is suitably secured to the base 84 by any conventional means. Centrifugal blower 8|, which is of the backward tipped blade type similar to blower 92 discussed above, is positioned underneath the combustion unit 12, and directly above the blower 6l the partition 18 is provided with an aperture 83 having a uniformly rolled edge to provide anozzle comlmunicating with the interior of the centrifugal blower wheel 5|. The bottom of the combustion unit 8l is spaced above the partition 18 and is suitably secured to the sides 85 of the combustion unit. The sides 85 of the combustion unit 1 2 are cut away at their lower portions to provide openings 88' between the feet or downwardly-extending portions which rest on partition 1B and are secured to strap members 93. A shroud or radiation shield B6 spacedly surrounds the combustion unit 12 and is mounted thereon and on the partition 18 by metal straps 93 which also serve to secure the combustion unit to the partition 18. These straps 93 may be screwed, welded, or otherwise secured. A

Upon operation of the blower 6|, air is pulled down through grille 61 to the downwardly-ex' tending air heating passage 81 (which is divided by wall 8i) through an opening 88, and through aperture or nozzle 83 into the blower 6| from which it is discharged into the flat chamber under the partition 18 and above the bottom 84. A long, narrow, integral grille 9| is formed r of integral tangs struck out of the casing sheet metal in a manner similar to that .described in connection with Figs. 1 to 4, inc., and the ends of the casing contain similar grilles 89 and 94. The high temperature heated air is discharged from the flat chamber under plate 18, through lgrille 89 and the long front grille 9|. In order to insure the discharge of this heated air from the whole length of grille 9| and also from grille 88, the tangs forming these grilles are rather closely spaced to form short and relatively restricted openings. Thus the total blower discharge opening from-'the cabinet is somewhat i restricted relative to the rate of blower discharge so that the fiat chamber under plate 18 is, in

eiiect, a plenum chamber from which the air -cation of Figs. 1 to 4, inc., the blower-forced air stream is given its horizontal direction by the blower blades themselves.v

'Il During blower operation, relatively cool air toA which is, in turn, journaled in be heated enters the cabinet through the upper grille 61 and through the end grille 94 electric motor 62. Thus there are a plurality of air inlets. `While a major portion of the air to be heated will be pulled down through the,upper opening 61, a portion of the air will enter through grille 94 and the opening about motor 62 and rise through the end air passage formed between the cabinet walls and the upright partition 69 from which it willv turn and be pulled down through the air heating passage around the combustion unit. This air rising up through the above-mentioned air passage will ilow all around the oil tank 68 `after having first been drawn past the electric motor 62 and the conltrol valve-float chamber unit 14 tioned in this passage alongside the electric motor 62.

During blower operation, `a naturalA upward ilow of air through this end passage containing the oil tank is assisted by the blower. apparent that when the blower' is not running, there will'still be a natural upward or thermal iiow of air through this passage which will mix with and temper the natural 'or upward thermal ilow of air through `the air heating passageway. Thus, during either operation, there is a cooling air flow for the oil tank, the electric motor, and

, the float chamber unit.

Blower 6| is rigidly mounted on a shaft 96 and. carried by a bearing member 91. This member is bolted or otherwise secured to the bottom 64.V It has a vibration-absorbing member 91A, of rubber or the like, between it andthe bottom 64 and bev tween it and its securing bolts to prevent any metal-to-metal contact and the transmission of vibration and noise from the blower wheel. A pulley 98 is keyed or otherwise secured to the lower end of shaft 96 and is driven by a conventional.V-belt 63 which is connected by a similar pulley to the lower endof the driving shaft of electric motor 62.

Air to supportcombustion in the unit 12- is drawn up by the normal draft suction through a plurality of vertical conduits |-l00 which are disposed on either side of the blower and extend from the combustion unit bottom 84, through the partition 18, down to andthrough bottom may be vregulated by suitable dampers 99-99 rotatable about pivots |0| to coverA or uncover the lower ends of the -conduits |00'|00.

In order to provide a forced draft for the combustion unit from the blower wheel 6|, the conduits |00-I00 have apertures |02-I02 directly facing the blower wheel discharge to receive hot air directly from this blower wheel and to convey the same into the combustion unit 12.

which is posii lIt will bev ,designated generally by the numeral |05 and and 4 v through the opening in the bottom about the comprising a strapmetal yoke |06 and a pair of legs |01-l01. 'I'he yoke |06 includes a, pair of curved elements |00 and |09 embracing the vertical sides ofthe motor 62, and the yoke |06 is provided on opposite sides thereof with -opposed necks ||0y joined by portions I-II The necks ||0 afford ilat surfaces for holes ||2 adapted to receive tie rods ||3| I2 so that clamping of'said tie rods may pinch the yoke about the body of `the motor 62. The lowerextremities of the legs IDT-|01 are bent horizontally to provide feet ||4-||4. The feet ||4| I4 are cooperatively associated with a' pair of slots IIE-H5 in the base 64 since bolts ||6||6 pass through the feet ||4"-| I4 and slots I |5-:-| I5 to clamp the motor in a desired position relative to theblower'. In order to dampen the vibrations set up by operation of the motor, the legs |01|01 are connected to the yoke |06 by sections of rubber ||1-'| |1 bonded in adhesion with the yoke and legs. Infaccordance with this construction, it will vbe noted that the motor is supported over the aperture 05 in such a way that to remove the motor for repairs all that is necessary is to remove the bolts ||6-'||6 and then to swing the motor and mounting through a quarter turn in order that it may be' removed through the aperture 06. f. Since it is generally desirable to use the blowerforced circulation only with high fuel settings, meansare provided to regulate the fuel settings and control they energization of the blower motor by a single manual control. As seen in Fig. 7'. the fuel valve unit 14 is controlled bya manual control disk H8 through shafts IIS, |20 and |24 and universal joints I2I and |23. This manual control disk I I8 is carried by a suitable bracket |25 which has integral therewith a shelf |26 and which is removably secured to the front of the casing 66 by screws |26A, thus permitting this bracket to be detached from the outside of the casing. Shelf V|26 carries a bifurcated lever either side of the lever |21 and mounted on the y openings in the cabinet bottom 64. 'l'he amount of combustion air drawn from under thecabinet vsince the fulcrum |28 is between anchorage of the spring |29, said spring will retain the lever |21 inA either of a resilient blade '|36 mounted means of a terminal bolt |38.

The area of these apertures |02 may be regul lated by sleeves |03-I03 which are telescoped over these conduits |00-I00and are provided `with cooperating apertures |04|04 which are adapted toiregister with the apertures |02`-|02. By rotating either or -both sleeves |03| 03 about the conduits |00|00, theeifective cross-sec-l tional area opening into these conduits may be a snap. It will shelf |26 effectively limit rotation of the lever about its fulcrum |28. It will be apparent that the points of- 'the positions shown. 'I'he lever |21 is so mounted as to be cooperatively associated with a'switch |35 having on a block |31. of some insulating material such as Bakelite by vThe blade is normally in' contact with a contact screw |38 so that an electric current may flow from a wire |4|` to-a wire |42 by way of the boltV |36, blade |36, screw |39, a wire |43 and motor 62. ExtendingV perpendicularly from the surface of the control disk IIBl a stud |44 is disposed in cooperative relationship with arms |45 and |46 of the lever |21. Asl rotation of the disk |I8 causes engagement of the stud |44 with one of the arms |45 or |46.' thelever |21 is rocked about its fulcrum from one extreme position toward the other extreme position, being resisted by the tension o'f the springV |29 vuntil a midway point is reached, beyond which the spring assists rocking of the leve;I |21 to a position of rest with therefore be apparent that, as

' lateral air opening mustrated'. counter-cikwise rotation of the disk I|6 has just opened the switch |36. Continued counter-clockwise rotation beyond this position I closes, and. continued clockwise rotation increases the amount of fuel fed to the burner 1|.

During clockwiserotation of the disk I I6, I passes under the bracket |26 and through the casing 66. By means ofthe snap-action of the switch |36, arcing between the screw |38 and blade |26 is minimized or obviated.

It will be apparent that this interconnection between the blower motor sA ual fuel setting control by means of a lost 'motion-snap action type of mechanism causes the' blower to be turned on or off when the fuel setting passes a pre-determined point while beingl turned up or down.

Cabinet shell or casing 66 slidably engages the sides of upright partition 69, is braced thereby, and may be suitably secured thereto if desired. It will be apparent that upon disconnecting the outer flue `connection and disconnecting the bracket |26 this cabinet shell 66 may be lifted up from the base 64 to expose all of the operating units which are carried on the base. This permits easy servicing and a simple factory assembly. l n

While only two embodiments of this invention are illustrated and described in detail herein, it is to be understood that various changes and modifications may be apparent to those skilled in theV art without departing fromv the spirit and scope of this invention, and therefore the same is only to be limited by the scope of the appended claims.

We claim: y

l. A Lunit space heater comprising an upright, noor-supponted cabinet containing a combustion heating. unit and a contiguous, downwardly-extending passageway for heating air to a high temperature, said cabinet and passageway having an upper ain opening and having a lower, lateral air opening communicating directlywith the room adjacent but safely above its floor, and fan means in the lower part of said cabinet and passageway discharging substantially horizon-- tally directly from its blades to and out through said lower opening directly into the room so that when said fan means is running it will pull air down through said upper opening and said passageway and discharge this high temperature air out said lower opening substantially horizontally and close to but safely above the room floor to prevent objectionable overheating to the floor close to the heater and, when said f an means is not running, air will rise up by thermal convection through said lower opening and said passageway and out said upper opening.

2. A unit space heater comprising an upright, floor-supported cabinet containing a combustion heating unit and a contiguous, downwardly-extending passageway for heating air to a high temperature; said cabinet and passageway having an upper air opening andhaving a lower, communicating directly with theroom adjacent but safely above its floor, and fan means in the lower part of said cabinet and passageway below said combustion unit and close along side of and discharging directly from its blades substantially horizontally to and directly the stud pport and the manand, when said fan will rise up by thermal convection through said out through said lower opening so that when said fan means is running it will pull air downv through said and discharge this high temperature air out said lower opening' substantially horizontally and safely abovethe room floor to prevent objectionable overheating of the iloor close to theheater means is not running, air

lower opening and said passageway and out said upper opening.

3. A unit space heater comprising an upright, y

floor-supported cabinet containing a combustion heating unit and a contiguous, downwardly-extending passageway for heating air to a high temperature, said passageway having an upper air opening and having a lower, lateral air opening communicating directly with the room adjacent but safely above its floor. and fan means in the lower part of said cabinet and passageway; an electric motor driving said fan means and positioned safely out of the path of high temperature air, said fan means discharging directly from its blades substantially horizontally to and out through said lower opening so that when said fan means is running it will pull air down through said passageway and discharge and horizontally direct this high temperature air out said lower opening and, when said fan means is not running, air will rise up by thermal convection through said llower opening and said passageway and out said upper opening.

4. A unit space heater comprising an upright, floor-supported cabinet containing a combustionl heating unit and acontiguous, downwardly-extending passageway for heating air to a high temperature, said passageway having anupper air opening and having a lower. lateral air opening communicating directly with the room adjacentits floor, and an upright axis, centrifugal blower wheel in the lower part of said cabinet f ing an upper air opening and passageway alongside of and discharging. directly and horizontally to and out through said lower opening so-that when said blower is running it will pull air down through said passage-` way and will direct and discharge this heated air horizontally from its blades out said lower opening and, when said blower is knot running,

air will rise up by thermal convection through said lower opening and said passageway and out said upper opening.

5.*A unit space heater comprising an upright, floor-supported cabinet containing a combustion heating unit and a contiguous, downwardly-extending passageway for heating air to a high temperature,

yand having a lower. lateral air opening communicating directly with the room adjacent its floor, and an'upright axis, centrifugal blower wheel in the lower part of .said cabinet and passageway -alongside of and v discharging horizontally directly to and directly out through said lower opening so that when said blower is running it will pull air down through said upper opening and said passageway and wili direct and discharge this heated air horizontally from its blades out said lower opening and, when said blower is not running. air will rise up by through said lower opening and said passageway and out said upper opening, said cabinet having a blower-driving electric motor positioned safely out of the path of high temperature air, and means to cool said motor including an opening in said cabinet adjacent upper opening and said passageway e said cabinet and passageway hav-A said motor to draw relatively cool air past said a closed bottom and feet to space it slightly above motor to the suction side of said blower. the room oor, and a grille forming lateral, sub- 6. A unit space heater including an' upright, stantially horizontally-directed air openings adiloor-supported cabinet containing a combustionjacent its bottom, said casingv containing Qa high heating unit and an associated, contiguous pastemperature combustion-heating unit witha consageway for heating air to a high temperature, .tiguous, upwardly-extending, air heating passagesaid cabinet and passageway having an air inlet way, the upper portion -of which opens through and having a narrow, substantially horizontallysaid upper air opening, and an upright-axis, cendireeted openingV across the front'portion of the trifugal blower having its intake communicating cabinet adjacent to but spaced slightly above the l0 with the lower portion of said passageway and floor, and fan means having its blades arranged positioned under said combustion unit at thelevel to discharge air horizontally and located in said of said lateralfopenings to discharge high temcabinet and passageway adjacent to and sub- I perature air therethroughinasubstantially horistantially .at the level of said opening to pull air zontal, forced stream spaced slightly above the through said air inlet and passageway and forciroom floor to avoid dangerous overheating therebly eject this high temperature air out through ,e oi', and an electric motor connected todrive said said opening directly into the room in a wide, blower and removably carried by said. bottom thin, substantially horizontal stream spaced out of the pathl of heated air, and means includabove the room floor sufliciently and at a velocity ing an opening through said bottom to vdraw high enough to prevent dangerous local overcooling air past said electric motor.y c z heating thereof.v l l0. A unit space heater including an upright, 7. A unit space heater comprising an upright sheet metal casing having an upper air opening, cabinet with a closed bottom spacedv above the a closed bottom and feet to'space it slightly above floor of the room to be heated by supporting the room floor, and a grille forming lateral, sublegs, a combustion-heatingunit and a contigistantiallyl horizontally-directed air openings adous. downwardly-extending passageway for heatjacent its bottom, said casingcontainlng a high Q ing air to a high temperature in said cabinet,` temperature `combustion-heating unit withaconsaid passageway and the top of said cabinet hav-r tiguous; upwardly-extending, all' heating P6888@- ing an upper air opening, said cabinet .having a way,the upper portion of which opens through long, narrow grille forming substantially horisaid upper air opening, and an upright-axis, zontally-directed and relatively restricted op'encentrifugal blower having its intake communicatingsacross its front portion adjacent the room ing with the lower portion' of Vsaid passageway o'or and immediately above the closed bottom, a and positioned under said combustion unit at the substantially horizontal partition spaced above level of said 1ateral openings to discharge high said closed bottom ladjacent the top of said grille temperature air therethrough iti Substantially to form a plenum chamber, an upright-axis, cenhorizontal, forced stream spaced slightly BbOVe trifugal blower ,wheel in said plenum chamber theroom floor to avoid dangerous overheating under said combustion-heating unit and supportthereof, and an upright electric motor `carrying ed on `said closed bottom byvibrationabsorbing the centrifugal blower ou the upper end of its means, opening means through said partition 40 shaft to form a removablefunit therewith, said communicating the lower end of said passageelectric motor being spaced below said bottom to way with the central portion of said centrifugal c keep it cool and being carried on a removable blower so that, during operation` of" said cenplate closing an. Opening in Said bottom' large trifugal blower, it will drawair down through enoughtopass saidblowe l said upper opening, said passageway, and said 1l. In a forced air circulating type. unit Space partition-opening means and discharge it lhoriheater, a rectangular type, open top cabinet havzontauy from its blades to and through said ins upright Sheet kmetal sidewalls and a closed plenum chamber and through thelength of said sheet metal bottom adapted to be spaced above long, narrow grillein a substantially horizontally the room floor, upright partition means extenddirected, wide, thin stream, or, when the blower is ing from front to 'back side walls and from said not operating, air.will enter said grille and, folbottom to. adjacent the top of said cabinet adjalowing the above path in reverse order, rise by cent and end thereof to form an open top air pasnormal thermal convectionk out of said upper sage, said bottom having Van opening under said opening.

` 8. Aunit space heater including an upright, partition in said passage, horizontal partition sheet metal casing having an upper air opening, means spaced above said bottom to form therepassage, a fuel tank supported on said upright a closed bottoni and feet to space it slightlyabove with and with said side walls and upright partithe room floor. and a grille forming lateral, subtion a flat plenum chamber, an upright air heatstantially horizontally-directed air 'openings ading unit supported on said horizontal partition, `jacentits bottom, and said casing containing a 50 a flat, upright-axis, centrifugal blower in and high temperature combustion-heating unit with discharging intosaid plenum chamber and posia contiguous, upwardly-extending, air heating tioned under said heating unit, said horizontal passageway, the upper portion of which opens partition having an opening communicating said through said upper air opening, and an uprightair heating unit to said blower intake, and subaxis, centrifugal blower having its` intake com- 55 stantially horizontally-directed air discharge municating with the lower portion of said pasopenings through the front vside wall from said` sageway and positioned under said combustion plenum chamber.

l `unit at the level of said lateral openings to horil2. "In Ya forced air circulating type, unit space zontally discharge high temperature air directlyv heater, a rectangular type, open top cabinet hav'- from its blades to and out said openings in a m ing upright sheetmetal side walls and a closed l substantially horizontal., forced .stream spaced sheet metal bottom adaptedV to be spaced above overheat-ing thereof.

slightly above the room floortoavoid dangerous the room iloor, upright partition `means extendy ing from front to back side walls andfromsaid 9. A unit space heater including an upright, ,i bottom to adjacent the top of-saidcabinetzadjasheet metal casing having an upper air opening, cent an end thereof to form an open top air pashaving an opening under said passage, a fuel tank supported on said upright partition in said passage, an electric motor in the lower part of said passage, and connected to drive said blower, horizontal partition means spaced above saidbottomlto form therewith and ,with said side walls and upright partition a flat plenum chamber, an upright air'heating unit supported on said horizontal partition, a ilat, upright-axis, centrifugal blower in and discharging into said plenum chamber and positioned under saidheating unit, said horizontal partition having an opening communicating said air heating unit 'to said blower intake, ly-directed air discharge openings through the front side wall from said plenum chamber.

sage, said lbottom and substantially horizontalvection 13. In a forced air circulating type, unit space heater having an upright cabinet with a closed bottom spaced slightly above the room iioor,`

means forming an opening the space below said bottom, a heater in said cabinet, an upright-axis, centrifugal blower in said cabinet adjacent its bottom, a removable closure member carrying said blower and closing an opening in said bottom large enough to permit withdrawal of said blower therethrough, said opening serving as an air intake upon removal of said closure member and blower.

' i4. In a unit space heater or the like, an upright cabinet having a substantially horizontal partition, a i'lat plenum chamber therein adjacent its bottom, a heating unit in said cabinet above ,said partition. a long, narrow, lateral grille forming relatively restricted, substantially horizontally-directed openings from said plenum chamber through'the cabinet side adjacent its bottom directly into the room to be heated, a fiat,v

substantially horizontally-discharging, centrifugal blower located in and discharging hot air Af'i'orxi above said partition into said plenum chamber to build up pressure therein so that hot air is discharged substantially horizontally and directly into the room throughout the length of said grille.

15. A unit space heater comprising an upright, cylindrical, sheet metal cabinet having a lower sheet metal bottom secured to and bracing said cabinet walls, and feet extending below said plate to support said cabinet on the floor of the room to be heated, a sheet metal partition secured to land bracing said cabinet walls closely above said bottom plate to form a flat chamber therebetween, an upright combustionheating unit removably supported in said cabinet above said partltion/plate, said cabinet enclosing a downwardlyextending air heating passageway contiguous to said combustion-heating unit and open at its upperand lower ends, a substantially flat, sheet metal top on said cabinet having a grille therein to form an upper opening communicating with the open upper end of said passageway, an integral, stamped grille of upright members across the lower front portion oi said cabinet walls forming a long, narrow opening from said fiat chamber, an upright-axis, wide, thin, backwardtipped bladed, centrifugal blower wheel positioned eccentrically to the rear in said fiat chamber, an upright-axis electric motor positioned below said lower plate and carrying said blower wheel on the upper end of its shaft, and means yleldingly and removably mounting said blower and motor on lsaid bottom..

16. A unit space, heater comprising an upright, licor-supported cabinet containing a combustion air heating unit, means to regulate the fuel supply thereto including a manual control -means in said cabinet culation of air through said cabinet in heat exchange relation with said combustion unit, fan means-in said vcabinet to circulate air downwardly therethrough vin reversed thermal con` flow and out said lower opening, an electric motor driving said fan means, a motor control switch interconnected with said manual control t'o energize said fan motor only for high fuel settings to give downward air ilow and to de-energine for lower fuel settings to permit said upward air ilow. y i

1 7. A unit space heater` comprising lan upright, Vfloor-supported cabinet containing a coinbustion air heating unit, means to regulate the fuel supply thereto including Aa manual control on said cabinet, Vmeans including an upper opening and a lower lateral opening in said cabinet to permit upward thermal convection circulation of air through said cabinet in heat exchange relation with said combustion unit, ian to circulate air downwardly therethrough in reversed thermal convection flow and substantially horizontally out said lower opening, means communicating with the discharge side of said fan means to supplt7 said combustion unit with air under forced draft during fan operation, an electric motor driving said fan means, a motor control switch interconnected with sald manual control to energize said fan motor for high fuel settings to give said downward air flow and forced draft to said combustion unit, and to de-energize it for lower fuel bustion air supply conduits, and said combustion air supply conduit having a cooperating opening facing said fan to supply forced draft from the fan to said combustion heating unit.

19. a unit space heater, a licor-supported cabinet enclosing an air heating unit and having a lower lateral air discharge opening adjacent to the room floor, and means including a fan having a substantially horizontal discharge directly from its blades at of said opening to force circulation of air '1n heating relation with said heating unit. and out said opening-.directly into the room horizontally I directed by the fan blades.

20. I n a forced air circulating type, unit space heater having an air heating unit, a floor-supported cabinet and having a bottom spaced above the room floor, means forming an opening from the room into the space beneath said bottom, an air circulating fan in said cabinet, an opening in said bottom large enough to permit removal of said fan therethrough, and means mounting said fan onl said bottom overl said opening and permitting removal of said fan therethrough, said opening serving as a relatively large, unobstructed, air

Aintake for gravity air, circulation when said fan is removed.

2l. In a forced air circulating, unit. room heatsubstantially the level y enclosing said air heating unit to and associated with er having a. floor supported .cabinet enclosing a high temperature combustion air heating unit and having a, bottom close to but spaced safely above the room floor, means including a fan inr said cabinet circulating air down'past said heating unit and discharging this high temperature air directly into the ro/omV` adjacent the floor, an electric motor connected to drive said fan, an opening in said bottom large enough to permit withdrawal of said fan therethrough, and meansmounting said fan on said bottom over said opening and carrying said electric motor y and preventing overheating thereof by shielding it from said high temperature air.

22. A unit heater for a roomor the like comprising a iioor supported upright casing, a high temperature combustion heating unit in said casing, a stack for said combustion heating unit.

means forming a downwardly extending high temperature air heating passageway contiguous said heating unit, air inlet means for the upper end of said passageway, a horizontally directed discharge opening from the lower part of said passageway directly into the room and positioned closely adjacent to but safely above theroom floor, a horizontally directed fan below said heating unit and at the level of said discharge opening to provide a forced stream of high temperature air directly from the fans blades out through said discharge `tion of said motor time pricing an upright, neer-supported cabinet. a combustion air-heating imit therein, a fuel reg- .ulating valve therefor alongside said combustion unit, an upwardly-extending, rotary, 'control shaft' to adjust said valve, means forming an air 'circulating passageway in heat exchange relation with said heating unit, fan means to force air through said passageway, a motor driving said fan means, and means, including a member carried by said shaft, controlling the energizeat an intermediate fuel setting.

- 2'?. A circulating air heater comprising a combustion air-heating unit, means forming an air circulating passageway in heat exchange relation therewith and operable by gravity air circulation, 4fuel supply regulating means, means to provide a forced air circulation through said passageway. control means therefor, and a common control so connected to said fuel supply regulating means and to said forced air circulation control that as the fuel supply, and hence opening and across the floor Without` objection'-v Iable overheating of said floor close to the heater.

23. An air circulating space heater comprising a floor-supported housing having an open upper end, a closed bottom, and a lower lateral opening, a combustion air-heating unit in 'said housing. a fan in said housing drawing air in 'said open upper end, down past said heating unit, and discharging it out said lower lateral opening, and a removableclosure member carrying said fan and closing an opening in said bottom large enough to permit removal of said fan therethrough, means to admit air to said bottom opening, said opening in said bottom serving as an additionalv air intake opening for gravity air circulation in the absence of said fan and closure member.

24. An air circulating heater comprising a combustion cir-heating unit having e steek and' operable by natural draft, 'meansforming an air circulating passageway in heat exchange relation ble -by gravity air circulation; fuel supply regulating means, means to supply therewith and opera forced draft combustion air to said combustion unit and to provide a forcedv air circulation through said passageway, control means therefor, and a, common control so connected to said fuel regulating means andy to said controlv means that for low fuel settings combustion is by gravity draft only and heated air circulation is by gravity circulation only, while for higher fuel settings I combustion is by forced draft andthe heated air circulation is forced. Y i v i 25. A heater comprising a` combustion heating unit, a stack gtherefor, means to supply combustion air thereto by gravity circulation, means to supply combustion air thereto under forced draft,

and control means therefor, infinitely variable fuel supply regulating means. and a common control means connected tov said fuel supply regulating meansand to said forced draft control means c so that for low fuel settings combustion is by gravity air circulation only and for higher fuel settings combustion is by forced draft.

26. An air circulating unit space beater com- 1 into the space to be setting the forced air circulation is started.Vv

28. A unit space heater comprising an upright cabinet containing 'a combustion-heating unit and having means forming a contiguous, downwardly-extending, air heating passageway, said combustion unit having an upper iiue means and an air supply means including a lower opening to atmosphere to supply combustion air for a moderate lire by thermal convection, said cabinet having means forming an upper air opening forv said passageway 1and having means air opening for the lower portion of said passageway, said lower opening discharging directly heated, a driving motor and a connected fan bothenclosed in the lower por--V vtien cf said cabinet te circulate air in said upper opening, down said passageway, and out said` lower opening, said` combustion air supply means including an opening to the-discharge side of said fan means to supply a forced draft for a high nre during operation of said fan means,

said cabinet having an upper said parts beingarranged so that, upon nonoperation of said fan means. air may'enter said and out said upper convection.` l '29. A circulating air heater comprisingan upopening by normal thermal right cabinet, a combustion heating unit therein, means formingan upwardly culating passageway in -heat` extending air cirexchange relation therewith and operable by gravity air circulation, l and a lower opening for said passageway, means to supply combustionairto said heating unit by gravity circulation, fan means adjacent said lower opening the heat output, is increased to an intermediate forming an I Y lower opening and rise through said passageway Y.

to cause a ow of'air down through said passageway and directly out into the space to be heated, and means forming a passageway from thedischarge side of said f fan means to said combustion heating unit to supply forced draft combustion air thereto only during operation of said fan means.v

30. In `a forced air circulating type unit space heater having an upright cabinet, an upright air heating combustion drum unit therein, a closed bottom for said cabinetv adapted to be spaced abovev the room floor, .a wide'partition means spaced close above and substantially parallel to said bottom forming therebetween a wide iiat Y plenum chamber and combustion drum unit'thereon, said cabinet havins restricted openings directly from said plenum plenum chamber under a ing.

I cassa I and\means into said chamber into the to force' air from charge. through all of said restricted openings.

3l. In a unit space heater or the like, an upright cabinet having means .forming a flat plenum chamber slight pressure for dis- 4 v 5 ing removable therein .adjacent and across its botto `a combustion heater in said cabinet 'l above said plenum chamber,'a long, relatively narrow grille of upright members in the cabinet side wall adjacent its bottom forming relatively 'restricted openings from said plenum chamber directly into the room, fan means in said cabinet discharging hot air from adjacent said heater f directly into said plenum chamber to build up a slight pressure only in said that said hot throughout the length of said grille and from all of its'openings. K

32. A unit space heater comprising a floor supported cabinet having a lateral opening adjacent the room floor, a fuel burner and an associated expansion chamber in said cabinet, and means including a vertical axis centrifugal blowery below said expansion chamber at the level of said opening and having a substantially horizontal -discharge directly from its blades to pull air in heating relation with said expansion chamber and discharge it horizontally to and plenum chamber so out through said opening into theroom to be.

heated.

33. In a direct tired type, unit spaceheater, an upright cabinet having a closed bottomedjacent the room door and having a lateral opening adjacent said bottom, a combustion heating unit in said cabinet, andan upright-axis centrifbeing heatedv in through said bottom opening, up said passageway, and out said open top, a

blower unit removably opening below said .expansion chamber and befrom beneath said cabinet to pull air downwardly in said passageway and toiforce it directly from saidiateral opening into the room to be heated in a horizontal stream, said blower unit comprising i0 an upright-axis centrifugal blower at the level air is discharged therefrom of said discharge open-ing and havinga substantially horizontal dischargeV directly from its l blades=through said discharge opening into the room to be heated, and a coupled, coaxial, blow- 6 er-driving electric motor under said blower andv positioned out of the path of the hot air to prevent ove'rheatingthereof.

36.'In combination, a vliquid fuel burner, a float chamber, means for delivering liquid fuel .zo thereto, e liquid fuel une extending from seid float chamber to said burner, means `for sup-4 plying air to said burner, including a motor, and a motor circuit therefor, a valve in said float chamber, adapted to control 'the flow of liquid 5 fuel from the iioat chamber to the burner, means foradlusting the setting of-l said valve, including an exterior manually operable rotatable knob, and means for controlling said motor circuit in predetermined relationship to the moveactuating means .being adapted to close .the

` switch in response to rotation of the knob only 35 after substantial opening of the valve has taken ugal blower wheel in said cabinet adjacent saidA bottom and 'discharging substantially horizonf tally and directly to and out `said opening di,`

rectiy into the room to produce a stream directed o horizontally by the blades of said blower wheel.

34. An air` circulating unit spacev heater com-l prising a floor-supported cabinet having an open top and a bottom opening, said. cabinet .containing a fuel burner and an upright expansion chamber therefor, and means forming an associated, upright and open ended air-heating passageway whereby natural gravity circulation of air being heated will be into said bottom opening, up said passageway, and means to pull air downwardly in said passageway and force it directly into the room to be heated in a low level, substantially horizontal stream, including a lateral discharge opening adjacent the room oor and a blower tioned in said bottom opening below said expansion chamber and being removable from beneath said cabinet, said blower unit comprising a driving electric ing a substantially horizontal discharge directly from its blades through said discharge opening and into the room to be heated.

place.

37. In combination, .in control means Vfor al a iloat chamber, a valve in liquid fuel burner, said chamber, and a valve seatto which it is opposed, means for opening and closing said valve, including a rotatable stem, a rotatable manual control knob for said stem located exteriorly of said float chamber, a switch, and

n means for controlling said switch in response f to rotation of said knob said means being adaptso and out said opentop,l

unit D051- v 35. An air circulating unit space heater `comprislng a licor-supported cabinet having an open topfand a bottom opening and an upright front wall with a lateral opening therein adjacent to and spaced safely slightly above the room floor, said cabinet containing a sion-chamber therefor above said lateral openand associated means forming an upright, open ended, air-heating passageway so vthat there will be a natural gravity circulation of air 70 adjacent said rotatablestem, and means for fuel burner, an expan' ed to close the switch only after knob movement sufficient to effect appreciable valve `opening has taken place. 38. Incombination, in control means for a liquid fuel burner, a float chamber, a valve in said chamber, and a valve seat to which lt is opposed, means for opening and closing said valve, including va rotatable stem, a rotatable 5 manual control knob for said stem located exteriorly of -said float chamber, a switch adjacent ,said control knob, and means for controlling said switch in response to rotation of said knob said means being adapted to close the switch only after vknob movement suilicient to eifect ap- '0 preciable valve` opening has taken place.

39. A fuel and air control device for a liquid fuel burner comprising a :Boat chamber, a rotary fuel metering valve for modulating the 5 rate of fuel feed from said chamber, means for positioned in said bottom low level, substantially 30 ment of said valve, including a-switch in said rotating said valve to adjust the same including la rotatable stem, a rotatable manualcontrol member for said stem located exteriorly of said float chamber, a' quick acting switch mounted actuating said switch in response to rotation of said manual control membe said means being arranged to closesaid switch only after knob movement sufiicient to effect appreciable valve s opening has occurred.

fuel burner comprising a float chamber. an infinitely variable rotary fuel' metering valve controllingthe fuel outlet from said chamber, means for opening and closing said valve including a rotatable control shaft, a rotatable manual control member secured to said shaft.

a snap action switch mounted adjacent said shaft, and means for actuating said switch in y response to rotation of said rotatable manual control member, said means being arranged to close said switch after rotation of said manual control member in one direction suilicient to effect appreciable valve opening and to open said switch after rotation of said manual control member in the opposite direction suillcient to effect partial closing of said valve;

4 1. A heater comprising a 'combustion 'heating unit, means to supply combustion air thereto by gravity circulation, a rotary fuel metering valve for manually modulating the fuel supply to said unit, electrically operated blower means to supply combustion air to said unit under forced draft,'a snap action switch for control--4 p 22,482 io. A rusland auccniroi device for e liquid ling said blower means. a manual rotary control member so connected to said fuelmeteri'ng valve and to said snap action switch that as the fuel supply is increased to a prescribed intermediate setting said snap Vaction switch is closed to eifect operation of said blower means.

42. A circulating Vair heater comprising a combustion air heating unit, means forming an air t circulating passageway permitting gravity circulation of air in heat exchange relationship with said heating unit, a rotary fuel metering valve for manually modulating the rate of combustion in said heating unit, electrically operated blower means to Supplyforced air circulation through said-passageway. a snap action switch for controlling said blower means, a manual rotary control member so connected t0 said fuel metering valve and to said snap action switch that as the fuel supply is increased to eect a prescribed rate of combustion saidsnap action switch is closed to eiIect yoperation of V said blower means.

GEORGE M. SCHUEDER. EUGENE FARRELL. 

